JP2008237252A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper favorably forming a three-dimensional shape by erecting an absorbent body in a crotch part and having superior fitting property and leakage prevention property. <P>SOLUTION: This disposable diaper 1 includes an absorbent body 4 having an absorbent core 2 and a surface sheet 3, wherein the absorbent core 2 has an absorber 5 having a central absorber 50 and side absorbers 51, an elastic member 6 for raising the side absorbers 51 when the diaper is worn, a cover sheet 7 for covering the whole of the absorber 5 and the elastic member 6, and the surface sheet 3 is stuck to the absorbent core 2 at a part 91 covering the central absorber 50, but not stuck to the absorbent core 2 in parts 92 covering the side absorbers 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disposable diaper, and more specifically, the present invention relates to a disposable diaper that is excellent in three-dimensional formation by standing up an absorbent body in the crotch part and excellent in fit and leakproof performance.

Conventionally, diapers of various structures have been proposed in order to prevent the diaper from being displaced due to the movement of the wearer and causing leakage.
For example, as a diaper that achieves both fit and leakage prevention at the crotch, the absorbent body is divided into three parts on the crotch, left side, center, and right side in the diaper width direction. For example, Patent Document 1 discloses a first absorbent body that is positioned flat in the center along the longitudinal direction of the diaper, and the first absorbent body. The first absorbent body on both sides of the body and a second absorbent body disposed at least partially spaced apart, and an elastic body is attached to the upper part of the second absorbent body, Disposable diapers in which a propensity for standing and gathers are imparted to the absorbent body are disclosed. This not only prevents the second absorber, which is designed to stand up, from acting as a leak-proof wall, but also prevents excrement that has reached it from leaking out by absorbing and holding it. Is.

By the way, the absorbent main body of the conventional disposable diaper which comprises the absorber divided into three parts in the crotch part as disclosed in Patent Document 1 is generally the entire absorbent body (the first and first). 2 for forming an absorbent core coated with a water-permeable coating sheet, and then standing up the absorbent core and the side absorbent on a surface sheet coated with an adhesive. The members are arranged and formed by covering them with a surface sheet. That is, a portion corresponding to the side absorbent body (second absorbent body) in the covering sheet is bonded and fixed to the topsheet with an adhesive, and an elastic member is provided between the topsheet and the covering sheet. Has been placed.
Therefore, in the conventional disposable diaper, not only the covering sheet but also the top sheet is bonded to the side absorbent body, so that the rigidity of the side absorbent body portion is increased, and the top sheet is made of the side absorbent body. Prevents the standing and prevents the stable formation of the three-dimensional structure (concave pocket structure formed by the central absorbent body and the side absorbent bodies on both right and left sides) that should be formed at the crotch. It was causing a decline.
Japanese Patent No. 2884355

  An object of the present invention is to provide a disposable diaper that is excellent in three-dimensional formation by standing up an absorbent body in a crotch part and excellent in fit and leakage prevention.

  As a result of intensive studies, the inventor forms not only an absorbent body but also an elastic member with a covering sheet to form an absorbent core, and a portion of the absorbent core that covers the side absorbent body of the covering sheet The side absorber can stand up independently without being affected by the rigidity of the top sheet, and it is formed by the central absorber and the left and right side absorbers. It has been found that the recessed pocket structure can be formed stably. The present invention has been made based on such findings.

The problems of the present invention have been solved by the following means.
[1] A disposable diaper comprising an absorbent main body having an absorbent core and a surface sheet covering the absorbent core,
The absorbent core is
(A) an absorbent body comprising a central absorbent body and a pair of side absorbent bodies provided on both sides in the longitudinal direction of the central absorbent body;
(B) an elastic member that is arranged along the longitudinal direction in the vicinity of the outer edge of the side absorbent body and stands up when the diaper is worn on the side absorbent body;
(C) a covering sheet that covers the whole of the absorber and the elastic member,
The surface sheet is bonded to the absorbent core at a portion of the covering sheet that covers the central absorbent body, and the surface sheet is bonded to the absorbent core at a portion of the covering sheet that covers the side absorbent body. A disposable diaper that is not glued.
[2] The disposable diaper according to the item [1], wherein the absorbent body is formed with a separation portion at least at the crotch portion between the central absorbent body and the side absorbent body.
[3] The disposable diaper according to [1] or [2], wherein the rigidity of the central absorbent body is higher than that of the side absorbent body.

In the disposable diaper of the present invention, an elastic member for raising the side absorbent body is disposed in the absorbent core, and the portion of the absorbent core covering the side absorbent body and the surface sheet are non-adhered. Therefore, the side absorbent body stands up well without being affected by the rigidity of the surface sheet material, the end of the side absorbent body is in close contact with the leg of the wearer, and the position by the wearer's movement Displacement hardly occurs and has excellent fit and leakage prevention.
Moreover, the disposable diaper of the present invention can be worn comfortably by the wearer because the side absorbent body stands up well even when an elastic member having a weaker elastic force than conventional ones is used, and there is little tightening by the elastic member.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to the illustrated embodiment. In the description of each drawing, the same elements are denoted by the same reference numerals.
FIG. 1 is a perspective view of a pants-type diaper as a preferred embodiment of the disposable diaper of the present invention. FIG. 2 is a plan view showing a state in which the diaper shown in FIG. 1 is separated and expanded by a side seal part, and the elastic member of each part is extended and expanded in a planar shape.

A disposable diaper 1 (hereinafter referred to as diaper 1) of a preferred embodiment shown in FIG. 1 is a so-called pants-type diaper. Although this specification demonstrates and demonstrates a pants-type diaper, this invention is not limited to this, The thing of what is called a tape type (development type) provided with the fastening tape for diaper fastening wearing may be used. .
As shown in FIGS. 1 and 2, the diaper 1 of this embodiment includes an absorbent main body 4 having an absorbent core 2 and a top sheet 3. The absorbent core 2 is liquid retaining, and the topsheet 3 is liquid permeable. It is preferable that the surface sheet 3 covers the entire region of the absorbent core 2 on the skin contact surface side. Moreover, the exterior body 10 is provided on the non-skin contact surface side of the absorbent main body 4.
The diaper 1 is divided into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the back of the wearer, and a crotch C positioned therebetween. The ventral side A, the back side B, and the crotch C are in the diaper 1 in a deployed and extended state (a state in which the elastic member of each part is extended and expanded in a flat shape, as shown in FIG. 2) in the longitudinal direction (FIG. (2 in the vertical direction), each region is divided into three regions so as to be divided into approximately three equal parts.

In addition, in this specification, the "skin contact surface side" is the side (surface) that is disposed on the skin side of the wearer when worn, on both sides (surfaces) of each member such as the absorbent core and the absorbent main body. ). The “non-skin contact surface side” is a side (surface) that is disposed on the opposite side of the skin side of the wearer when worn, on both sides (surfaces) of each member.
The “longitudinal direction” is a direction parallel to the long side of each member. Hereinafter, the phrase “width direction” may be used, which is a direction orthogonal to the longitudinal direction.

The absorbent main body 4 has a vertically long rectangular shape, and a known joining means such as a hot-melt adhesive is used so that the longitudinal direction thereof coincides with the longitudinal direction of the diaper and extends from the abdominal side A to the back side B. Thus, the outer body 10 is joined to the central portion in the width direction.
The exterior body 10 is configured such that both side edges of the portion located on the ventral side A and both side edges of the portion located on the back side B are connected to each other by known joining means such as heat sealing, high frequency sealing, and ultrasonic sealing. It joins and a pair of side seal part is formed by this. Moreover, the waist opening W and a pair of leg opening parts L and L are formed in the diaper 1 by the joining.
The above-mentioned structure of the diaper 1 of this embodiment is the same as that of a conventionally well-known diaper.

Below, the absorptive core 2 in the diaper 1 of this embodiment is explained in full detail, referring FIGS. FIG. 3 is a plan view of the absorber in the diaper shown in FIG. FIG. 4 is an enlarged cross-sectional view schematically showing a cross section taken along line IV-IV of FIG. 2 of the absorbent main body 4 in a diaper use state.
As shown in FIGS. 2 and 4, the absorbent core 2 includes an absorbent body 5, an elastic member 6, and a water-permeable covering sheet 7.

2 to 4, the absorbent body 5 includes a central absorbent body 50 and a pair of side absorbent bodies 51 and 51 provided on both sides in the longitudinal direction of the central absorbent body 50. 50 and the pair of side absorbers 51, 51 are separated from each other at least at the crotch portion C, and separation portions 52, 52 are formed. As shown in FIG. 3, in the absorbent body 5, the pair of side absorbent bodies 51 and 51 are connected to each other at the front part F and the rear part R of the central absorbent body 50. Therefore, the cut-out portions 52 and 52 having a hollow shape provided on both sides of the central portion M of the central absorbent body 50 are provided between the central absorbent body 50 and the pair of side absorbent bodies 51 and 51, respectively. Is formed. Here, the front part F, the central part M, and the rear part R are the regions when the absorbent body 5 in the state shown in FIG. 3 is divided into three regions so that the entire length in the longitudinal direction is divided into approximately three equal parts. It is. In this embodiment, as shown in FIGS. 1 and 2, the absorbent body 5 has side absorbent bodies 51, 51 arranged on the crotch C, and the front part F of the central absorbent body 50 on the ventral part A. It is arranged in the diaper 1 so that it may be located.
The thickness of the absorbent body 5 (the central absorbent body 50 and the side absorbent bodies 51 and 51) is preferably 2 to 20 mm, more preferably 5 to 15 mm, from the viewpoints of softness and fit.

As shown in FIG. 2, the central absorbent body 50 includes a T-shaped upper absorbent body 501 and an hourglass-shaped lower absorbent body 502 larger than the upper absorbent body 501. The upper absorbent body 501 is superimposed on the skin contact surface side of the lower absorbent body 502 from the front part F to the central part M of the lower absorbent body 502. The pair of side absorbers 51 and 51 are formed integrally with the lower absorber 502. Both the upper absorbent body 501 and the lower absorbent body 502 are made of a mixed product of fiber components such as pulp fibers and a superabsorbent polymer. With such a configuration, the rigidity of the central absorbent body 50 can be made higher than the rigidity of the side absorbent body 51, and the side absorbent body 51 can be erected satisfactorily. Can be absorbed.
However, the present invention is not limited to such an embodiment as long as the rigidity of the central absorbent body 50 can be made higher than that of the side absorbent body 51. For example, the upper absorbent body 501 may be formed using a different material (for example, non-woven fabric) from the lower absorbent body 502. Alternatively, the upper absorbent body 501 may not be provided, and a single layer structure including only the lower absorbent body 502 may be used, and the central portion (the central absorbent body 50) of the lower absorbent body 502 may be woven with a high basis weight.

Here, “rigidity” can be expressed by the buckling strength of the sheet material. The buckling strength of the nonwoven fabric used in the diaper of the present invention is preferably 100 cN or less, particularly preferably 70 cN or less. Here, the buckling strength is measured by a compression test mode of a Tensilon universal testing device (Orientec Co., Ltd.) as shown below.
Buckling strength test method (CD): Take a rectangular test piece of 150 mm in the machine flow direction (MD) and 30 mm in the direction orthogonal to the machine flow direction (CD) to make a cylinder with a diameter of 45 mm and a height of 30 mm and overlap. The upper end and the lower end of the part are stopped with a stapler or the like to obtain a measurement sample. This is measured by a compression test mode of the Tensilon universal testing apparatus at a measurement environment of 20 ° C., 65% RH, and measurement conditions of a compression speed of 10 mm / min and a measurement distance of 20 mm. The maximum strength when the sample is compressed by 20 mm is measured for each sample, the average value is obtained, and this is taken as the buckling strength.
In the present invention, the rigidity of the central absorbent body 50 and the side absorbent body 51 is appropriately determined from the viewpoints of absorption capacity, leak-proof function, wearing feeling when wearing diapers, and the like. In particular, the rigidity of the side absorber 51 is appropriately determined from the viewpoint of easiness of standing.

Further, as shown in FIGS. 5A to 5C, the shape of the absorbent body 5 is such that the pair of side absorbent bodies 51 and 51 are not connected to the central absorbent body 50, and the central absorbent body 50 and the side absorbent bodies are absorbed. The body 51 may be completely separated. 5A to 5C are plan views of the absorbent body 5 in the diaper according to another embodiment of the present invention.
As for the absorber 5 shown by Fig.5 (a)-(c), as for all, the center absorber 50 and a pair of side absorber 51,51 isolate | separated, and the separation part 52 is formed. In the absorbent body 5 shown in FIG. 5A, the central part M of the central absorbent body 50 is formed narrower than the front part F and the rear part R. In the absorbent body 5 shown in FIG. 5 (b), the pair of side absorbent bodies 51, 51 are formed only in the central portion M. In the absorbent body 5 shown in FIG. 5C, the central part M of the central absorbent body 50 is formed narrower than the front part F and the rear part R, and the pair of side absorbent bodies 51, 51 are in the middle. The widths of the front part F and the rear part R of the central absorbent body 50 are formed only in the part M and extend to the outer edges of the pair of side absorbent bodies 51, 51. Thus, when the center absorber 50 and the side absorber 51 are separated, it is not necessary to provide a difference in rigidity between the center absorber 50 and the side absorber 51.
In addition, as will be described later, the absorber 5 is entirely covered with a covering sheet 7 together with the elastic member 6. Therefore, in the absorptive core 2, a part of the covering sheet 7 exists in the separation portion 52 in FIGS. 2 and 5A to 5C, and the distance between the central absorbent body 50 and the side absorbent bodies 51 is present. Is fixed.

As shown in FIGS. 2 and 4, the elastic member 6 is arranged along the longitudinal direction in the vicinity of the outer edges of the pair of side absorbers 51, 51. The elastic member 6 is arranged on both side ends of the absorbent core 2 in the width direction of the diaper 1, and extends between the ventral side A and the back side B of the diaper 1 in the longitudinal direction of the diaper 1. More specifically, the absorbent core 2 is disposed so as to extend over substantially the entire length in the longitudinal direction.
In the present invention, the elastic member 6 for raising the side absorbent body 51 is disposed in the absorbent core 2 and covers the side absorbent body 51 of the covering sheet 7 in the absorbent core 2 as will be described later. The part 92 has a configuration in which the absorbent core 2 and the top sheet 3 are not bonded. By adopting such a configuration, when the elastic members 6 arranged at both end portions of the absorbent core 2 contract, both end portions of the absorbent core 2 are not affected by the rigidity of the surface sheet material 3. The side absorbent body 51 rises well and the side absorbent body 51 stands up well evenly, so that when the diaper is worn, the end of the side absorbent body 51 is evenly closely contacted with the wearer's leg and effectively prevents side leakage of excreta. It has the effect of preventing.

The elastic member 6 is fixed to the adjacent side absorber 51 and the covering sheet 7 in an extended state, and when the diaper is worn, the elastic member 6 contracts so that the side absorber 51 in the crotch C stands up. Has been made.
Bonding and fixing of the elastic member 6 to the side absorber 51 and the covering sheet 7 can be performed using any bonding means such as a hot-melt adhesive or heat sealing. The entire elastic member 6 may be fixed to the side absorber 51 and the covering sheet 7. Further, only the both end portions of the elastic member 6 may be fixed to the side absorbent body 51 and the cover sheet 7, and other portions may not be bonded to the side absorbent body 51 and the cover sheet 7. Thus, by fixing only the both end portions of the elastic member 6 and making the intermediate portion non-bonded, there is an advantage that the contraction force of the elastic member 6 is increased and the side absorber 51 is raised.

As the elastic member 6, elastic materials such as natural rubber, polyurethane resin, urethane foam resin, elastic nonwoven fabric or hot melt elastic member are used as thread (thread rubber), belt (flat rubber), net (network). Or what was formed in the film form is used preferably.
The type, fineness, elongation rate, and number of the elastic members 6 are not particularly limited. Further, the elastic member 6 may be provided with a stretchable portion and a non-stretchable portion. For example, a portion of the elastic member 6 corresponding to the central portion M of the absorber is a stretchable portion, and corresponds to the front portion F and the rear portion R. It is good also considering the part to do as a non-expandable part. The ratio of the stretchable part and the non-stretchable part at this time is not particularly limited.

The said covering sheet 7 is water-permeable, and has coat | covered the whole absorber 5 and the elastic member 6, as shown to FIG. In the absorbent core 2 formed by this coating, the elastic members 6 are located at both side ends of the absorbent core 2.
The covering sheet 7 is a sheet-like material formed from tissue paper, non-woven fabric, or the like, and has a size capable of covering the entire absorbent body 5 and elastic member 6. The basis weight of the covering sheet 7 is preferably 10 to 20 g / m ² .
Covering the absorbent body 5 and the elastic member 6 with the covering sheet 7 can be performed using any joining means such as a hot-melt adhesive or heat sealing.

  The absorbent core 2 is formed so that the entire absorbent body 5 and the elastic member 6 are covered with the covering sheet 7 and the elastic members 6 are positioned on both side ends thereof. Here, in the separation part 52 where the absorber does not exist, the covering sheet on the skin contact surface side of the absorbent core 2 and the covering sheet on the non-skin contact surface side are bonded and fixed by an adhesive.

  In the diaper 1, as shown in FIG. 4, the top sheet 3 covers the entire region on the skin contact surface side of the absorbent core 2 and the entire region on both side edges in the width direction of the absorbent core 2. Here, the surface sheet 3 is a portion 91 (skin contact surface side: 91a, non-skin contact surface side: 91b) that covers the central absorbent body 50 of the cover sheet 7 in the absorbent core 2. It is glued. On the other hand, in the part 92 (skin contact surface side 92a, non-skin contact surface side: 92b) which covers the side absorbent body 51 of the covering sheet 7 in the absorbent core 2, the top sheet 3 is bonded and fixed to the absorbent core 2. It has not been.

The surface sheet 3 is bonded and fixed with an adhesive to the covering sheet 7 that covers the skin contact surface side of the central absorbent body 50, and the covering sheet 7 and the surface that cover both the skin contact surface side of the central absorbent body 50. A joint fixing portion 91 a is formed between the sheet 3 and the sheet 3. The said joining fixing | fixed part is formed over the full length of the absorber 5, The number and formation position can be set arbitrarily.
On the other hand, in the portion 92 (skin contact surface side 92a and non-skin contact surface side 92b) of the absorbent core 2 that covers the side absorbent body 51 of the cover sheet 7, the topsheet 3 and the absorbent core 2 are bonded and fixed. It has not been. Thus, by making the surface sheet 3 and the absorbent core 2 non-bonded at the portion 92 covering the side absorbent body 51, the side absorbent body 51 stands up well without being affected by the rigidity of the topsheet 3. Thus, when the diaper is worn, a concave pocket structure can be stably formed in the crotch portion with the central absorbent body and the left and right side absorbent bodies upright.
In order for the side absorbent body 51 to stand well without being affected by the rigidity of the top sheet 3, the side absorbent body 51 stands on the top sheet 3 that covers the non-adhesive portion 92 that covers the side absorbent body 51. For this reason, it is preferable to use a material that can maintain a sufficient amount of space, or that has a low frictional resistance between materials (between the top sheet 3 and the cover sheet 7).

  Moreover, in the diaper 1 of this embodiment, both side edge parts 31 and 31 of the surface sheet 3 are respectively wound down to the non-skin contact surface side of the absorptive core 2, and the non-skin contact of the center absorber 50 is carried out. A joint fixing portion 91b is formed between the covering sheet 7 that covers both the contact surfaces and both side end portions 31 and 31 of the surface sheet.

  Moreover, in the diaper 1 of this embodiment, a region including a portion extending inward in the diaper width direction from the side end portion 31 of the topsheet 3 and the end portion of the leakage preventing cuff forming sheet 12, The corresponding covering sheet 7 is also integrally bonded and fixed with an adhesive, and a bonded fixing portion is formed. This joint fixing portion is effective for stable arrangement of the absorbent core 2, the surface sheet 3, and the leak-proof cuff 14.

As shown in FIG. 2, the diaper 1 of this embodiment includes an exterior body 10 on the non-skin contact surface side of the absorbent main body 4.
The exterior body 10 is composed of two sheets and elastic members of respective parts fixed between the two sheets. Between the two sheets, a waist elastic member 16 that forms a waist gather at the peripheral edge of the waist opening W, a leg elastic member 17 that forms a leg gather at the peripheral edge of the leg opening L, and The waistline elastic members 18 forming the waistline gathers in a state of being divided into the waistline part D which is a region from the position 20 mm below the peripheral edge of the waist opening W to the upper end of the leg opening L, respectively. In the stretched state, it is bonded and fixed by a bonding means such as a hot melt adhesive.

Further, as shown in FIG. 2, on both sides in the longitudinal direction of the absorbent main body 4, the leak-proof cuff forming sheet 12 and the leak-proof cuff forming sheet 12 are provided over the entire length of the absorbent main body 4. A leak-proof cuff 14 is formed by the elastic member 13 fixed in the extended state.
In the diaper 1 of the present embodiment, a sheet-shaped water-repellent sheet having a predetermined width is folded as a leakage-proof cuff forming sheet 12 in two along a fold line along its longitudinal direction, and the opposite layers are hot-melted. A two-layered sheet bonded with an adhesive or partial heat or ultrasonic seal is used. The leak-proof cuff elastic member 13 is fixed in an expanded state between the layers of the two-layered sheet.

The leak-proof cuff forming sheet 12 covers the absorbent main body 4 from the skin contact surface side to the non-skin contact surface side in each of the abdominal side portion A and the back side portion B. Are joined to the skin contact surface side of the absorbent main body 4 by known joining means such as a heat seal, a high frequency seal, an ultrasonic seal, and a hot melt adhesive.
The leak-proof cuff 14 can stand at least in the crotch part C. At the free end of the leak-proof cuff 14, a leak-proof cuff elastic member 13 is disposed along the free end. A plurality of elastic members 13 may be provided.

  Moreover, in the diaper 1 of this embodiment, the longitudinal center part of the liquid-impermeable back sheet 8 is joined to the skin contact surface side of the exterior body 10, and the skin contact surface side of the back sheet 8 is bonded to the skin contact surface side. The leak-proof cuff forming sheet 12 and the absorbent main body 4 are sequentially joined. With this configuration, both longitudinal ends of the back sheet 8 are both longitudinal ends of the joint portion between the outer package 10 and the back sheet 8 (boundary portions between the longitudinal center and both longitudinal sections of the back sheet 8). As a starting point, it comes to stand up toward the wearer together with the leak-proof cuff forming sheet 12, and the leak-proof property of the absorbent body is further enhanced. For joining these members, joining means such as a hot melt adhesive can be used.

As a material which comprises each part of the diaper 1 of this embodiment, what is normally used in the said technical field can be especially used without a restriction | limiting.
For example, as the surface sheet 3, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 8, a liquid-impermeable material or a water-repellent material can be used. As the liquid-impermeable material, a resin film, a laminate material of a resin film and a nonwoven fabric, or the like can be used. As the water-repellent material, a water-repellent nonwoven fabric or the like can be used. As the water-repellent nonwoven fabric, a nonwoven fabric described later as a leak-proof cuff forming sheet can be used.

  As the absorbent body 5, a fiber aggregate made of pulp fibers or the like, or a fiber aggregate and a water absorbent polymer (mixed product of water absorbent polymer and fiber material) can be used. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer and a saponified product thereof, and polyaspartic acid. As fibers constituting the absorbent body 5, for example, hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide are used. it can. The water-absorbing polymer and the fiber can be used alone or in combination of two or more.

As the leak-proof cuff forming sheet 12, a composite nonwoven fabric having a multilayer structure composed of spunbond, meltblown, spunbond, etc., a spunbond nonwoven fabric, a heat bond nonwoven fabric, an air-through nonwoven fabric, etc. can be used. from the point, the nonwoven fabric preferably of the multi-layer structure comprising a spunbond and meltblown basis weight about 12 g / m ² is preferred.
The sheet 12 for forming a leak-proof cuff preferably has a water pressure of 3 cm or more measured according to a water resistance test (low water pressure method) in the waterproof test method of JIS L1092 (1998) textiles, and is 5 cm or more. More preferably. When measuring the water pressure resistance, the level device filled with water was raised at a speed of 10 ± 0.5 cm / min, and it was visually observed that water came out from three places on the back side of the test piece. Measure the water level at the time. In addition, it will measure without delay when the installation of the test piece is completed.

  As an adhesive used for joining and fixing the above-mentioned members, a hot melt adhesive is preferable. Examples of the hot melt adhesive include SIS (styrene-isoprene-styrene block polymer), SIBS (styrene-isoprene-butadiene-styrene block copolymer), SEBS (styrene-ethylene-butylene-styrene block polymer), SEPS (styrene- Styrene elastomers such as ethylene-propylene-styrene block polymers); ethylene-vinyl acetate copolymers; elastomers such as polyesters, acrylics and polyolefins; rubbers such as polyisobutylene, butyl rubber, polyisoprene and natural rubber Preferably used.

The application shape of the hot melt adhesive is not limited to a spiral shape, and may be a bead shape, an omega shape, a wave shape, or the like. Further, the coating method is not particularly limited, and a known method such as a coater method, a spiral method (such as an omega method or a duraave method), a spray method, or a curtain spray method can be used.
The application amount of the adhesive is preferably 3 to 15 g / m ^{2 and} more preferably 5 to 10 g / m ² from the viewpoint of the balance between the adhesive strength and the breathability and flexibility of the sheet.

  In the diaper 1 of this embodiment, the elastic member 6 for raising the side absorbent body 51 is disposed in the absorbent core 2, and the surface sheet 3 and the absorbent core 2 are covered by the portion 92 that covers the side absorbent body 51. And the side absorbent body 51 can stand up well without being affected by the topsheet 3. And the edge part of the side absorber 51 closely_contact | adheres to a wearer's leg part, and the position shift by a wearer's movement does not occur easily, and it is excellent in fit property and leak-proof property.

  As mentioned above, although this invention was demonstrated with the preferable one embodiment, this invention is not restrict | limited to the embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of this invention.

FIG. 1 is a perspective view of a pants-type diaper as a preferred embodiment of the disposable diaper of the present invention. FIG. 2 is a plan view showing a state in which the diaper shown in FIG. 1 is separated and expanded by a side seal part, and the elastic member of each part is extended and expanded in a planar shape. FIG. 3 is a plan view of the absorber in the diaper shown in FIG. 4 is an enlarged cross-sectional view schematically showing a cross section taken along line IV-IV in FIG. 2 of the absorbent main body in a diaper use state. 5 (a) to 5 (c) are all plan views of an absorbent body in a diaper according to another preferred embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Absorbent core 3 Top sheet 4 Absorbent main body 5 Absorber 6 Elastic member 7 Cover sheet 31 End 50 of the top sheet Central absorber 51 Side absorber 52 Separation part 91 Portion 91a which covers the center absorber The part covering the central absorbent on the skin contact surface side (adhesive part)
91b A portion (adhesive portion) covering the central absorbent body on the non-skin contact surface side
92 A portion 92a covering the side absorbent body 92a A portion covering the side absorbent body on the skin contact surface side (non-adhesive portion)
92b A portion (non-adhesive portion) covering the side absorbent body on the non-skin contact surface side

Claims (3)

A disposable diaper comprising an absorbent main body having an absorbent core and a surface sheet covering the absorbent core,
The absorbent core is
(A) an absorbent body comprising a central absorbent body and a pair of side absorbent bodies provided on both sides in the longitudinal direction of the central absorbent body;
(B) an elastic member that is arranged along the longitudinal direction in the vicinity of the outer edge of the side absorbent body and stands up when the diaper is worn on the side absorbent body;
(C) a covering sheet that covers the whole of the absorber and the elastic member,
The surface sheet is bonded to the absorbent core at a portion of the covering sheet that covers the central absorbent body, and the surface sheet is bonded to the absorbent core at a portion of the covering sheet that covers the side absorbent body. A disposable diaper that is not glued.   The disposable diaper according to claim 1, wherein the absorbent body has a separation part formed at least in a crotch portion between the central absorbent body and the side absorbent body.   The disposable diaper according to claim 1 or 2, wherein the rigidity of the central absorbent body is higher than that of the side absorbent body.

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